Loud with vibrations from the rear end (?) at 50 mph

Acquired my 2nd van recently ... now I am a bona fide enthusiast. It really is a gem for the price i gave. It's biggest issue is that at 50 mph it gets loud with vibrations seemingly coming from the rear end. Mysteriously, it smoothes out at 60. Runs great at speeds below 50.

I trailered it home from out of my area for this reason and haven't tested it on the open road . Any thoughts or diagnosis?

Check the drive shaft, similar thing was going on with mine before it failed. They can do lots of damage at higher speeds. I have an OEM one on a parts van still if you want to go that route. I put an aftermarket on mine for around $350 as they are more better.

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Originally Posted by Riverology

Check the drive shaft, similar thing was going on with mine before it failed. They can do lots of damage at higher speeds. I have an OEM one on a parts van still if you want to go that route. I put an aftermarket on mine for around $350 as they are more better.

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Thanks for the great info amigo. I was guessing that it could be in the drive line. A mechanic pal down the street is going to drive it soon and hopefully diagnose it. I will update soon.

I had a similar issue a few years ago, changed out the u joints, no joy. Eventually I figured out it was the pass side rear wheel bearing, swapped in a used axle. No issues since. Replacing the bearings with new is the way to go, if the driveshaft proves good.:yes:

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Originally Posted by technocj

I had a similar issue a few years ago, changed out the u joints, no joy. Eventually I figured out it was the pass side rear wheel bearing, swapped in a used axle. No issues since. Replacing the bearings with new is the way to go, if the driveshaft proves good.:yes:

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Thanks for sharing info on this issue. Haven't had time to get to the bottom of this yet.When I do, i will post.

I failed to mention that the issue is with a 4wd AT van.